Currently there is certainty only of the fact that witnesses heard a strong roar, a kind of explosion, with consequent rubble fall, and that the victims are two, the occupants of the AW-609 tilt-rotor of AgustaWestland, an aircraft for civil use still in an experimental phase. The crash happened in the skies of Vercelli, between Santhià and Tronzano, around at 10am of otoday. "It flew low on...